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用脉冲电流冲击熔池,使熔池产生有规律的振荡,造成孤长和电弧电压有规律的变化,检测电弧电压变化量及其变化规律,发现熔池振荡频率与熔池尺寸有一定的对应的关系。本文介绍了能产生冲击电流的晶体管电源及熔池振荡信号检测系统。研究了电弧参数如弧长、脉冲电流幅值,脉冲电流持续时间等对产生熔池振荡的影响。研究了熔池振荡特性与熔池尺寸的关系,发现随着熔池上面和背面宽度的增加,熔池振荡频率下降,找出了不同板厚熔池尺寸与其振荡频率的关系,把熔池振荡特微做为熔透控制信号,是一条可行的途径。
The impulse current impacted the puddle to cause the puddle to generate regular oscillations, resulting in the regular change of arc length and arc voltage. The change of arc voltage and its variation were detected. It was found that the frequency of puddle oscillation had a certain correspondence with the size of puddle Relationship. This article describes the transistor can generate the impact of current power supply and pool oscillation signal detection system. The influence of arc parameters such as arc length, pulse current amplitude and pulse current duration on the pool oscillation was studied. The relation between the oscillation characteristics of the molten pool and the size of the molten pool was studied. It was found that the oscillation frequency of the molten pool decreased with the increase of the width above and below the molten pool, and the relationship between the size of the molten pool and its oscillation frequency was found. Micro as a penetration control signal, is a viable way.